If anyone does or could thrash a MK 5 action, it would take quite a mistake using the wrong powder and charge.

All these discussions about action strengths and which rifle has the most durable is really kinda of a useless discussion imo.

If one keeps their max loads up to what the rifle can handle without pressure signs, that is all that`s needed.

Whether a Wby, a Marlin, a Winchester, a Ruger, a Browning, a Remington, a Savage, or whatever, take care of the action and it will take care of you.

28 Nosler,,,,300WSM,,,,338-378 Wby,,,,375 Ruger